Fidelity has for a long time charged no concessions on Treasuries bought at original auction, but this month they eliminated concessions on secondary market Treasuries trades as well.
Of course, for the secondary market stuff they can (and will) be making money on the spread and markups/markdowns, I imagine. Whether they will increase markups/markdowns to make up for eliminated concession, who knows. Apply the level of cynicism you deem proper :)
-- Rich Carreiro snipped-for-privacy@rlcarr.com